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Marketable Securities (Investments Available For Sale) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	$ 78,427	$ 81,507
Gross unrealized gains	2,657	1,816
Gross unrealized losses	0	0
Available-for-sale securities, fair value	81,084	83,323
SEI-Sponsored Mutual Funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	7,634	7,612
Gross unrealized gains	1,388	1,242
Gross unrealized losses	0	0
Available-for-sale securities, fair value	9,022	8,854
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	2,760	2,615
Gross unrealized gains	22	164
Gross unrealized losses	0	0
Available-for-sale securities, fair value	2,782	2,779
Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized cost	68,033	71,280
Gross unrealized gains	1,247	410
Gross unrealized losses	0	0
Available-for-sale securities, fair value	$ 69,280	$ 71,690

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

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- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

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